In Overlord I, there were several bugs and issues that were fixed. This is a good thing, even if there are still a few that remain in the game. There is a new main Overlord in this version of the game, but this guy gets a bit impassive, so he can get boring after a while. You'll have to learn how to release and control your minions to do your bidding, and you have to master this quickly so that you don't get too far behind your empire take over. And, you will also have to discover all four different types of minions during your game so that you can take over more areas and use different types of attacks.
One major difference in Overlord II is the variety that you now have when it comes to possessing your minions and the more options that you have available to you with them as well. You will also have access to massive machinery such as catapults and turrets, and you'll also be able to man your own ships to go up against the empire. So, in terms of game play overall, Overlord II is a huge step up from the first version and makes this second installment even better and more enjoyable.